Heart rate is a measurement of the number of times a person's heart beats in one minute. Normal heart rates vary with a person's age and with excitement and exercise. Abnormal heart rates are too slow, too fast, and/or irregular (too much variation in the rate).
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2

Not caffeine:
When you say, "bpm of 320 from caffeine" I am assuming that you are saying your heart rate is 320 beats per minute. A heart rate that fast is not simply the stimulate effects of caffeine. If your heart rate is 320 bpm, you need emergency evaluation today for arrhythmia due to an abnormal mechanism.

5

Atypical reaction:
Cannot say in your particular case, but generally, of course it speeds up the heart a little bit. If the change was under 10 beats per minute it is just coincedence. Assuming the heart rate really did decrease there are still several possibilities. One is there is a reflex slowing of the heart if the blood rpessure increases. Or stimulation of the gut (vaso vagal reaction) or relaxed w. drink

6

Unlikely:
It would be very unlikely that any damage has occurred based on what you have described. Other over the counter products such as pseudofed can have similar effects as caffeine. as well as foods and beverages can also have lower doses of caffeine that could be contributing. Hope that helps

11

Was doc concerned?:
Was your doctor concerned with this finding at your visit today? Very specific issues are best dealt with individually. A fast heart rare at ten weeks is not something we usually focus on

Fast rate:
It takes longer than an hour for the heart rate to return to normal (55 -90) if a significant amount of caffeine was ingested. Alcohol also affects the heart rate. For some people 55 is a normal rate and for others, 90 would be normal.

15

Possibly:
Having a slightly high heart rate with no other symptoms could be normal or due to anxiety. Granted you had an EKG when you were younger it might be wise to see your doctor if recheck of that would be indicated. Good luck.

Therapy?:
In addition to what needs to be evaluated for you physically, have you yet tried any form of psychotherapy? Typically, the optimal combination of things to treat emotional issues such as panic/anxiety/depression is medication (which, on your best day, is supposed to take the edge off symptoms) but the real gruntwork takes place in psychotherapist's consulting room.

If you are worried:
Go to an urgent care center, especially if you are feeling lightheaded. Caffeine can do all the things you are experiencing, and you need to avoid using that much caffeine in the future. Despite the fact that there is caffeine in coffee, the amount in some of these energy drinks is much higher, and can have some nasty effects.